Fan diffuser



R. B. RESPESS FAN DIFFUSER Filed Sept. 27, 1924 .[711/ eni or I 7(413 (Mag a??? :95

w 6 M m z till nary devices Patented Dec. 3, 1929 PATENT OFFICE ROLAND B. EESPESQ, 0F WICKFOIRD, BHQDE IELANU FAN DIFFUEEER Application filed September at, rear. serial No. masts.

This invention. relates to air circulating or ventilating systems and particularly to devices which may be associated with power driven fans for increasing their effectiveness in causing proper and thorough circulation of air within a given space.

Numerous devices are at present in use for distributin fresh air to rooms through duct systems and for stirring up the air to secure an artificial breeze. The duct systems may w distribute air to the different rooms or to various parts of the room but suchsystems fail in providing a proper means of circulating such air when delivered. As an aid in the distribution of the air electric fans are sometimes used to stir up the air in the room and some electric fans areequipped with oscillatory devices so that a breeze is intermittentlydelivered to dilierent parts of the room, but they fail however to cause a thorough circulation of the air within a given space and cause drafts that are dangerous and are commonly regarded as contributing to various illnesses. lo obtain proper ventilation it is necessary that the air be in continuous uni form circulation throughopt all parts of the room and be kept in continuous motion to enable the oxygen to counteract the impurities ever-eiristent in the air.

Ubjects of this invention are to provide a new and improved system'of air circulation whereby the entire volume of air is kept in continuous movement within a given space; to provide means by which the air body is 35 broken up so that the fresh air may mix easily and intimately with the stagnant air so the new oxygen may counteract the impurities in the air; to provide a ventilating system that will provide a sufficient supply of fresh as air to every part of a room without draft; to

provide a simple and inexpensive device for association with power driven fans which in creases air circulation to a marked degree without objectionable draft caused by. ordiof this character; and to design such a device having the unique mode of oper ation and detailconstructionhereinafter fully described.

The invention relates. to air circulation within a given space, the air being forced into such space through duct systems or open windows. In one phase the invention comprises a device which is adapted for association with power driven fans. Preferably the device is in the form of a hood or shield adapted to be substituted for or associated with the usual wire fan guard. This hood may be provided with'a number of parallel openings which are horizontally disposed when the hood is in place, and adjacent to each opening a deflector may be arranged-to detlect the air ina given direction. The size of the openings, and position and design of the deflectors are so chosen that the air is impelled in a vibratory manner and a slight compression'talres place as the air is driven from the hood...

A. genus of the invention is illustrated in the accompanying drawings in which Fig. l is a side elevation of an electric fan of the usual type equipped with a hood embodying the present invention:

Fig. 2 is a perspective view; and

Fig. 3 is an enlarged diametrical vertical section of the hood.

lln the illustrated .embodiment of the invention the electric fan comprises a supporting base 1 on which. is mounted for rotative adjustment an electric motor 2 having a shaft to which a fan comprising the blades 3 is attached, a control lever i being provided for regulating the speed of the motor. Electric fans of this character are usually provided with a wire guard for preventing accidental contact with the rapidly rotating blades, the guard being attached to radially extending braces 5.

In accordance with the present invention Eli till

ill

the usual wire guard is removed and a shield or hood 6 replaces it, the hood being made of sheet metal or other suitable material and is attached by the braces 5. As shown the hood 6 is shaped more or less like a shallow pan, being preferably circular in form and comprising a front wall 6 and an integral, annular, rearward sidewall or flange 8, the back of the hood being open. The front wall 6 is provided, as by cutting or slitting the metal, with a plurality of parallel, closely spaced openings 9 which extend substantially the on tire width of the hood. The metal above each continuous current but is driven therefrom opening iszbent rearwardas indicated in Fig. A cover for the blades of a fan comprising 3 to form a plurality of. parallel louvers or a hood of thin sheet material havin a front deflectors 10. It will be observed that the Wall provided with a plurality 0% 'angularly bent deflectors and the interspaced parallel openings a closed side wall 5 mediate strips 7- together form a surface surrounding the bladesof the fan, and apluwhose area is approximately twice as great rality of deflectors carried by said front wall, as that of the openings 9. each deflector extending lnwardlv toward the I en the motor 2 is started the blades 3 are blades of the f l m 11 edge 0 an openin rotated at a very great speed and the air is slgned by me at Boston, Mass., this 25151 in drawn freely through the open back into the y Of p m 1924- hood where it takes up a rapid whirling for ROLAND B. RESPESS. ward motion sweeping a ainst the inclined deflectors 10, thus being roken up into innumerable eddies, and is then driven into the 1 elongate pockets formed by the strips 7 and deflectors 10 and thence outwardly through the openings. Owing to the fact that each of the s aced fan blades tends to produce an individ ilal current or zone of pressure, there is a constant forward force pressure of these 86 currents. Furthermore, because the size, of the openings 9 is much less than the combined area of the strips? and deflectors 10, the whirling air is not impelled from the hood in a 1n vibrating waves in an upward direction. 90 The area of the open back of the head through which the air enters is much greater than the is delivered in vibratory waves it expands 35 quickly in every direction and a very great volume of air is kept in uniformly continuous motion without drafts.

he outstandin characteristic of this invention is its capability of producing a circu- 40 lation of air in a g'ven space so that the entire volume of air therein is affected and kept in continuous motion without the creation of space, with a pleasing and somewhat exhilano uniform absorption of pure live air into the body through the lungs and pores. The system or method in its essential details consists in thoroughly an energetically agitat- 55 direction through nozzles or openings having deflectors in such a we as to create air impu s or waves. In t is manner a curious vibratory effect is obtained which materially assists the air current in assimilating or so mingling with the air in all parts of a iven 06 Iclaim. m 

